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Stones last won the day on February 6

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  1. Our last house had a low temperature radiator / heat pump system, flow temp of 33C at 0C ambient. Worked perfectly well. The radiators were sized between 3 and 4 times larger than they would have been in a conventional CH system. Dividing the stated output by that multiple would therefore give you a rough idea of what you will get output wise at UFH flow temps.
  2. Stones

    Septic Tank v Sewage Treatment Plant

    We emptied ours after 18 months. Tanker driver suggested two years, if not three.
  3. Stones

    Wood Fibre

    This is what a friend of mine did to get round the issue. Worked well, if a little time consuming, as a solution.
  4. Stones

    GSHP likely to be better choice...

    When I looked at GSHP vs ASHP, I found that with a heating demand below 5000 kWh/yr it would actually cost MORE to run a GSHP vs an ASHP once you had taken into account the energy cost for the additional pumps required in a GSHP system, and that was before factoring in the cost of replacement antifreeze, or the higher capital costs. I recall pointing this out to the salesmen and they all, to a man, responded by saying 'but look at the RHI payments you would get'. Enough said.
  5. Stones

    Part 26 - Wall mounted Solar PV system

    Just a quick update to this, installation notified to the DNO under G83/2. Easy to do - a notification form (detailing installation address, MPAN, technology and installer - electrician in my case), Schematic of installation (kindly provided by @ProDave) Type Test Certificate (of the Inverter - obtained from list on Energy Network Association website). For completeness, I also sent them a site plan. System working well, and array generation peaked at 1503W today, 3W more than the notional maximum of the 6 (250W) panels combined.
  6. Stones

    BT Monopoly

    The old new customer / existing customer conundrum, although last time I tried with BT, they refused to budge on price, only offering an improved package once the order for another provider had gone through the system (I could have stayed as the offer was in the cooling off period). Switched to EE (same group, better deal and £50 preloaded credit card). £25.50 a month line rental, broadband and anytime calls.
  7. Stones

    Part 26 - Wall mounted Solar PV system

    As Jeremy says, no requirement for MCS, but has to be a competent person, i.e. electrician. Details here from an earlier thread.
  8. Stones

    Part 25 - Heating and DHW system performance

    Yes: 17/18 - DHW 2394 kWh (input)/ 5424 kWh (output) Heating 1874 kWh (input)/6513 kWh (output) 18/19 - DHW 2346 kWh (input)/ 5271 kWh (ouput) Heating 2133 kWh (input)/7635 kWh (output) Household use 4150 kWh give or take both years
  9. Stones

    PV split over two roof planes

    Notwithstanding the above, @ProDave notified SSE about his system on a G98 form rather than G83 form. Not quite sure why SSE advised him to do so given the taking effect date. As I have a system to notify I'll be asking the question.
  10. Stones

    PV split over two roof planes

    Reading through the actual blurb, G98 doesn't take effect until April: 'Requirements for the connection of Fully Type Tested Micro-generators (up to and including 16 A per phase) in parallel with public Low Voltage Distribution Networks on or after 27 April 2019'
  11. Stones

    Part 25 - Heating and DHW system performance

    A brief update to this as I now have two years worth of data. Over the 12 months March 2018 – March 2019, heating COP ranged between a February low of 3.3 to an October high of 4.6 over the course of the heating season, with an overall SPF of 3.8 (slightly better than year 1) DHW COP ranged between a February low of 2 to a summer high of 2.5, with an overall SPF of 2.3 Energy use overall remains roughly the same (a difference of 250 kWh between 17/18 and 18/19). Household use was within 12 kWh (yes, that's just 12 kWh difference over the year). 18/19 saw slightly lower DHW use, but slightly higher heating requirement. Costs have therefore remained static as it costs less to heat than to provide DHW.
  12. A sort of sister thread to the one here: This blog entry details the installation of my wall mounted Solar PV system:
  13. Having originally planned then dropped the idea of Solar PV (a combination of budget constraints and drop in FiT rates) I recently acquired a number of Solar PV panels (a pallet bought in conjunction with @ProDave from Bimble Solar via Ebay). Having recently collected the panels, lengths of mounting rail and various other bits and bobs @ProDave had kindly sourced, I fitted the system over the last two Saturdays. First off was mounting the rails on my rear, SW facing garage wall. I decided to mount the panels vertically simply for ease - a ready made structure to fix the rails to, and easy access to a consumer unit for the grid connection. There is a penalty in terms of a reduction in annual generation compared to a sloped array, however simplicity won out. The following picture shows the garage wall with rails fixed; To start I nailed packers to the cladding to ensure I had a drainage gap behind the rails. I then fixed the rails (Unistrut - a tip from @Onoff) through the cladding, cladding battens into the timber frame of the garage using timber drive bolts I happened to have. As the lengths of Unistrut I had were offcuts (only way I could transport them) I used joiners secured to the channel with bolts/channel nuts. Finally, I added hanging brackets for each panels to help carry the weight of each panel / so I wasn't reliant purely on bolts clamping the panels in position. I fitted the panels, sitting them on the hanging bracket and bolting them around 300mm from top and bottom as pictured; The ends were secured using Z brackets I cut down using a grinder (thanks @JSHarris) so that they clamped only the frame and did not overhang the panel itself; Long M6 bolts with large washers were used to secure the panels into the rails where they met with each other; The channel nuts (also known as Zebedees) into which the long M6 bolts were secured; I used M8 bolts and channel nuts for the joiners, end and hanging brackets. My electrician connected the system up, wiring the panels to a DC isolator, into the Inverter which in turn is wired into the garage CU via a meter and AC isolator. 2 hours work for him. Switched on, the Inverter ran through all its self tests and everything okay. Sadly at that point it clouded over and the heavens opened so only a few watts being generated. Fortunately, today has been a bright and sunny day (albeit a bit hazy) and my 1.5 kWp system is as we speak, generating 1.2kW. The following shot was taken yesterday just before the rain came on, but all in all, I'm pleased with the way it looks (panels mounted so they read visually with house windows). Cost wise the system (1.5kWp plus a spare panel), mounting rails, nuts, bolts, brackets, isolators, meter and electrician (@Prodave was kind enough to give me the DC cable he had left over which was just enough for the job) total £550. I already had the inverter. Final job within the next 28 days is to notify the DNO of the installation.
  14. Stones

    PV split over two roof planes

    I think that's what the G98 protocol covers (supersedes G83 as of April)
  15. Stones

    PV split over two roof planes

    We had SE and SW orientated PV arrays at our last house, the SE array added about 12 months after the SW array (which took us from G83 to G59). I had anticipate a much better spread of useable generation, but the reality was only really marginal in terms of extending the generation window. Winter generation was still pitiful, and in summer, there was far too much to use (especially peak of the day).